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  • Switched voltage regulatorIn the past a replacement voor the (hot!) 7805 has popped up a couple of times in various threads. As far as I know, Recom Power Inc. was always ment…

    ... as the 7805 doesn't need to drop as much voltage :)
    regulator mounted on an external heat ...
    Dan Antohi Dan Antohi January 2015 Hardware
  • another non working issue 3 48kHi all, next! :) I don't have good filings about this speccy :) https://youtu.be/D9qpCR18-kI here is short video what this speccy do. we hav…

    What voltage do you get on the +9V line (test on the input pin to the 7805 regulator)?
    What is the actual +12V line voltage?
    What is the actual -5V line voltage?

    [b][i]Mark[/i][/b]
    1024MAK 1024MAK July 2015 Hardware
  • Issue with TV signal + Inductor Coil (16K Issue 2 Speccy)Hello guys, I just got a 16K Issue 2 Speccy from eBay. It was sold as not working so I knew there would be some work needed before it's working ag…

    The voltage at the transistor end of ... correctly (which they are), the voltage here is a AC pulse ... waveform, NOT a DC voltage.

    The important measurements ... , the +5V output from the 7805 regulator, and the +12V and -5V ...
    1024MAK 1024MAK August 2017 Hardware
  • Spectrum 128k advice neededHi, I'm new to this forum and the spectrum world. I have this spectrum "toastrack" that was working fine until today. It doesn't boot anymore, it s…

    ... when measuring the 7805. On my multimeter this regulator is 4.98v ... logic probe.

    Also voltage to the RAM chips is ...
    gleegum gleegum July 2020 Hardware
  • TIPP31 transistor questionYesterday I had the time to try and repair a 4S issue 48k spectrum I had. First of all I replaced all the electrolytic capacitors. The tr4 transistor…

    ... it looks just like the 7805 regulator (it has a metal back ...
    gtsamour gtsamour May 2007 Hardware
  • Unconventional way of diagnosing a faultHi everyone Some time ago I got a 48k Spectrum (issue 3B board) in a pretty bad condition. I believe the power supply transistor TR4 failed, causing…

    ... to overheat and shatter. The 7805 regulator also blew up causing quite ...
    Avian Avian May 2007 Hardware
  • Voltage SchmoltageOk then. Don't flame for wanting to use a C64 tape deck for this - it was the only one I have to hand which may be cannibalised for the purpose. So …

    ... . But where to get this voltage from? I know that we ...
    wilsonsamm wilsonsamm July 2007 Chit chat
  • Repair options for my own dear old Spectrum 48k?Hello all, This is my first post to this wonderful forum, which is part of a truly great website! My name is Arnold, and I live in Utrecht, The Nethe…

    ... details: I have measured the 7805 regulator, its upper pin is 4 ...
    ZXHistory ZXHistory October 2009 Hardware
  • Two Odd Spectrum 128K FaultsI also have 2 Spectrum+128 machines with heatsinks. 1. Did not power up properly - I replaced the 7805 regulator and cleaned the edge connector and …

    ... up properly - I replaced the 7805 regulator and cleaned the edge connector ...
    rwap rwap May 2010 Hardware
  • How to fix dc voltage on a 48+ psuAfter dinner, after a womble video out mod on a "new" purchased 48+ , just in the remaining time I tested the voltage of its psu and, surprise surpr…

    ... remaining time I tested the voltage of its psu and, surprise ... pcb for trimming the output voltage. Can I add a resistor ... to trim the voltage to a more cool 9 ...
    Cignale Cignale June 2010 Hardware
  • Spectrum 48k PSU voltageI have been running into problems with my rubber key speccy. To cut a long story short I did a voltage check of my power supply. It seems to fluctuat…

    ... story short I did a voltage check of my power supply ...
    pasty72 pasty72 February 2011 Hardware
  • Grey +2 regulatorIv just checked the regulator and its a TS2940. Could someone tell me the equivalent please?

    Iv just checked the regulator and its a TS2940. Could someone tell me the equivalent please?
    Modge Modge March 2011 Hardware
  • Upgrading the Humble Spectrum 128 +2 (Grey)Hello there my fellow WoS'ers I am at a subtle in-pass in my wants for one of my +2 motherboards. I received this mobo, DOA in a job lot from fleab…

    ... had gotten into it) and 7805 regulator was as dead as a ...
    Zetr0 Zetr0 May 2011 Hardware
  • Second Hand SpectrumHi just joined the Forum. I have picked up a Spectrum at a s/h shop and would like some advice please. I have had two ZX81's packed away for severa…

    ... the open circuit (no load) voltage is 14v.
    On one ... case was hot (by the 7805 reg) and also the power ...
    mcnaugg mcnaugg October 2011 Hardware
  • 7805 cooler replacement?I have been looking into finding some replacement for the 7805, since that single component generate a lot of heat. Been looking at switching alterna…

    ... finding some replacement for the 7805, since that single component generate ...
    Johan1973 Johan1973 April 2012 Hardware
  • Spectrum 48K help neededI hav got an old Specrtum 48K issue 3. When I plug-in power connector it doesn't show the home screen (c) Sinclair.... From about 50 times trying to …

    ... got it working ULA and 7805 were warm (aboput 45 degress ... remins cold. I have checked voltage lines (+5, -5, +12) and ...
    btrafela btrafela June 2012 Hardware
  • ZX81 back porch fix using LM1881Hello! Has anyone here did the back porch fix for ZX81 using LM1881? I did it this weekend and instead of clear black on white i got black on dark g…

    ... />
    One more thought: The voltage divider in the circuit has ... is over 40C for example. 7805 heat sink cannot be touch ... ?
    Also, the measured voltage from 7805 is not 5V but 4 ...
    ArtemKuchin ArtemKuchin July 2012 Hardware
  • Spectrum+ and dead keyboardI have a Spectrum+ which had no picture just snow on TV. I found instructions, that it might be regulator 7805, so I changed it. Now I saw something …

    ... instructions, that it might be regulator 7805, so I changed it. Now ...
    lillaolle64 lillaolle64 August 2012 Hardware
  • THE VOLTAGE OF THE POWER SUPPLY UNITCould anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]…

    Could anybody who has a ZX Spectrum 128k +2 count with a voltameter the voltage which the power supply unit gives to the Spectrum and tell me the [B]exact[/B] reading?
    George George August 2012 Hardware
  • Lower Memory - Why Multiple Voltages?Having spent much of the weekend working on getting my old Spectrum working, my Dad (who is visiting) and I were chatting about the schematic. Given…

    ... - which only has a supply voltage of +5V, why on earth ... the LM1889 and then the 7805 to derive the 5v.
    ramsrc ramsrc October 2012 Hardware
  • PlusD mini - production startedI'm developing a PlusD clone, with some features stripped to make it very affordable. The real PlusD and German clone have an 7805 regulator, but I …

    ... and German clone have an 7805 regulator, but I don't think ... DivIDE does not use an 7805, I see no reason why ...
    bverstee bverstee December 2012 Hardware
  • ZX Breakout availabilityOK - after much procrastination, this board is now available! Details on the board are here: - [url]http://spectrum.alioth.net/doc/index.php/ZX_Bre…

    ... or XC95144XL), a 3.3v regulator and ROMCS mechanism.

    voltage regulators, edge connectors etc. as ... own components, make sure the regulator has the same pin-out ...
    Winston Winston January 2013 Hardware
  • Issue 4S AnnoyanceRecently ive been going through a few interfaces testing them and I stupidly inserted a "key-less" interface (didnt know at the time but should have …

    ... board, everythings soldered in, quick voltage test of lower ram checks ... that be all it is? Regulator checks out ok too btw
    Macc Macc May 2013 Hardware
  • Issue 4A repair attemptI think I need some help. I have a nice Issue 4A main board here, which does not give out any video signal. I checked some voltages (the ones that se…

    ... me) and found that the 7805 regulator didn?t do anything, so ...
    schombi schombi July 2013 Hardware
  • Voltage converter question.I recently paid over $100 for a really solid nice looking 750 watt 110v to 220 v converter so that I can run some my UK appliances when they come ove…

    ... />
    However, this second 'cheapo' voltage converter does not appear to ... any side effects with the voltage converter?
    Scottie_uk Scottie_uk September 2013 Chit chat
  • Opus Discovery OddnessHi everybody, I'm busy trying to repair an Opus Discovery for a customer. It's proving to be quite frustrating. First off, the LM317T regulator fo…

    ... br /> First off, the LM317T regulator for the 5V was producing ... At which point the voltage plummeted back to 1. ... Disconnect the aerial lead. Voltage goes up to 5.0V ... Replace the aerial lead, voltage down to 1.6V. ... a picture, but the voltage is still too low ...
    Spirantho Spirantho September 2013 Hardware
  • Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …

    ...

    Various switches, connectors, 7805 regulator etc

    Optional :
    lezanderson lezanderson December 2013 Hardware
  • Homebrew ZX Spectrum kits for DIY builders !Hi. I'm considering selling Homebrew ZX Spectrum kits on ebay... hopefully at a low price ! They'd consist of : Z84C0020PEC Z80 CPU …

    ...

    Various switches, connectors, 7805 regulator etc

    Optional :
    lezanderson lezanderson December 2013 Hardware
  • Harlequin - usefull mods and addsHello, I start here a thread regarding mods and adds for the Harlequin. It was found: * that the Sinclair Interface 1 does not fully work at the Ha…

    ... it is a rectangular AC voltage to be directed to -12V ... -5V I used a 79L05 regulator reducing the -12V.
    Each ... for me is a volume regulator for the 32 Ohm speaker ...
    ingo ingo May 2014 Hardware
  • Powering a Spectrum with 5v?I live in the States, but I'm originally from England. My original Spectrum is still at my mum's house in the UK, and I was thinking of asking her t…

    ... won't work on mains voltage here in the States.
    regulator, and inject a regulated 5v into where the voltage output ... of the regulator was?

    Jamesbeat Jamesbeat August 2014 Hardware
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